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This is heartbreakingly beautiful. Very well-written. I like the way you showed Aoko maturing in the way she acts, not only her speech patterns, but also the way she works through her confusion, anger and grief.
All in all, excellent work!

Ps: I know you said that you won't be continuing this story, but sure would be interesting to read should you ever decide to turn this into a chapter fic! Seeing Aoko and Conan working together would be great, especially since Jii is getting so old.

I'm crying, it's so good !